/Engine/Plugins/FX/Niagara/Source/NiagaraEditor/Public/NiagaraStackEditorData.h
Gets whether or not a stack entry was Expanded before triggering a stack search.
bool GetStackEntryWasExpandedPreSearch ( const [FString](API\Runtime\Core\Containers\FString) & StackEntryKey, bool bWasExpandedPreSearchDefault ) const